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Joint Ventures - Additional Information (Detail) $ in Thousands | Sep. 30, 2019 USD ($) joint_venture lot | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 24,600 |  |  |
Number of joint ventures | joint_venture | 6 |  |  |
Expected production of finished lots | lot | 6,400 |  |  |
Total lots controlled by company under the joint venture | lot | 3,050 |  |  |
Total lots either under contract with unrelated parties or not under the current contract | lot | 3,350 |  |  |
Additional funding commitments in the aggregate | $ 4,700 |  |  |
Number of joint ventures with additional funding commitment | joint_venture | 3 |  |  |
Number of joint ventures NVR is not primary beneficiary | joint_venture | 5 |  |  |
Other Assets [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 24,600 | $ 29,400 |  |
Home Building [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 18,337 | 16,982 |  |
Accrued expenses and other liabilities | 319,347 | 332,871 |  |
Consolidated Joint Venture [Member] | Home Building [Member] | Other Assets [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 293 | $ 320 | $ 335 | $ 1,069
Consolidated Joint Venture [Member] | Home Building [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Accrued expenses and other liabilities | $ 263 |  |  |

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